El yacimiento prehistórico de El Collado (Olica, Valencia): una necrópolis de los últimos cazadores de la Península Ibérica

Hace unos 9.000 años, algunas de las últimas comunidades de cazadores-recolectores del Mesolítico ocuparon las orillas del Mediterráneo. Se trataba de lugares excepcionales en los que poder vivir y desarrollar sus actividades económicas y subsistenciales. Su dieta se basaba en la ingesta de alimentos de origen animal y vegetal que obtenían a partir de la caza, la recolección de frutos y vegetales, y en la consecución de fauna marina (pescados, moluscos, crustáceos, etc.). Se trataba de grupos nómadas que iban moviéndose y asentándose en distintos lugares. Esos movimientos estaban relacionados, probablemente, con la explotación de determinados recursos, su disponibilidad en ciertos momentos del año, las características ambientales y paisajísticas del lugar, su accesibilidad, etc. En todo caso, a menudo se trata de lugares que no se ocupan solamente una vez, sino que se frecuentan de manera recurrente. Este es el caso del interesante yacimiento de El Collado, en Oliva. Su importancia reside en el hecho de ser un asentamiento al aire libre ocupado en distintos momentos a lo largo de más de un milenio, cuando la mayor parte de los yacimientos de este periodo se documentan en cuevas o abrigos. En este lugar, no sólo se ha hallado la necrópolis mesolítica más importante de España, sino que cronológicamente es la primera de toda la Península Ibérica. Sin embargo, siendo uno de los yacimientos más relevantes del oeste del Mediterráneo, ha sido escasamente publicado y estudiado (García Guixé et ál., 2006; Aparicio, 2008; Aparicio, 2014). Estamos ante un contexto arqueológico con una potencialidad enorme del que estamos seguros que en el futuro se obtendrán nuevos datos sobre las comunidades que allí vivieron, de gran relevancia para el estudio de los últimos grupos de cazadores-recolectores en el levante ibérico.Peer reviewe

Associated Benthic Fauna to the Vermetid Reefs along the Mediterranean Spanish Coast

The aim of this study was to investigate the benthic fauna associated to nearshore vermetid reefs. Sampling was conducted along the Mediterranean coast of Spain, in three different areas, using scraping techniques, to characterize the taxonomic assemblage living among and inside the Dendropoma empty shells. The results showed high abundance and very low taxa diversity

Age-related clonal haematopoiesis is associated with increased epigenetic age

Age-related clonal haemopoiesis (ARCH) in healthy individuals was initially observed through an increased skewing in X-chromosome inactivation [1]. More recently, several groups reported that ARCH is driven by somatic mutations [2], with the most prevalent ARCH mutations being in the DNMT3A and TET2 genes, previously described as drivers of myeloid malignancies. ARCH is associated with an increased risk for haematological cancers [2]. ARCH also confers an increased risk for non-haematological diseases, such as cardiovascular disease, atherosclerosis, and chronic ischemic heart failure, for which age is a main risk factor 3, 4. Whether ARCH is linked to accelerated ageing has remained unexplored. The most accurate and commonly used tools to measure age acceleration are epigenetic clocks: they are based on age-related methylation differences at specific CpG sites [5]. Deviations from chronological age towards an increased epigenetic age have been associated with increased risk of earlier mortality and age-related morbidities 5, 6. Here we present evidence of accelerated epigenetic age in individuals with ARCH

Oscillatory motions observed in eruptive filaments

Context: The origin of the variable component of the solar wind is of great intrinsic interest for heliophysics and space-weather, e.g. the initiation of coronal mass ejections, and the problem of mass loss of all stars. It is also related to the physics of coronal neutral sheets and streamers, occurring above lines of magnetic polarity reversal. Filaments and prominences correspond to the cool coronal component of these regions. Aims: We examine the dynamical behaviour of these structures where reconnection and dissipation of magnetic energy in the turbulent plasma are occurring. The link between the observed oscillatory motions and the eruption occurrence is investigated in detail for two different events. Method: Two filaments are analysed using two different datasets: time series of spectra using a transition region line (He I at 584.33 A) and a coronal line (Mg X at 609.79 A) measured with CDS on-board SOHO, observed on May 30, 2003, and time series of intensity and velocity images from the NSO/Dunn Solar Telescope in the Halpha line on September 18, 1994 for the other. The oscillatory content is investigated using Fourier transform and wavelet analysis and is compared to different models. Results: In both filaments, oscillations are clearly observed, in intensity and velocity in the He I and Mg X lines, in velocity in Halpha, with similar periods from a few minutes up to 80 minutes, with a main range from 20 to 30 minutes, cotemporal with eruptions. Both filaments exhibit vertical oscillating motions. For the filament observed in the UV (He I and Mg X lines), we provide evidence of damped velocity oscillations, and for the filament observed in the visible (Halpha line), we provide evidence that parts of the filament are oscillating, while the filament is moving over the solar surface, before its disappearance.Comment: Accepted in A&

The neolithic necropolis of Feixa del Moro (Juberri, Andorra): review and new data

[EN] The data presented in this paper resume all the available information on the Feixa del Moro site, correcting old mistakes and bias, updating the 1980s archaeological registers and presenting new analyses as well. Our aim is to ensure that Feixa del Moro remains a reference site for the Pyrenean and Western Mediterranean Neolithic. At the same time, we wish to encourage other researchers to undertake new analyses and to embrace new perspectives in order to improve our understanding of Neolithic societies.[FR] Le travail que nous présentons ici rassemble toutes les données disponibles sur la Feixa del Moro jusqu’à aujourd’hui, expose les confusions détectées dans les sources, actualise les registres archéologiques obtenus dans les années 1980 et présente les résultats des nouvelles analyses effectuées. Grâce à cette démarche nous souhaitons que ce site continue d’être une référence pour le Néolithique dans les Pyrénées et la Méditerranée occidentale. Nous souhaitons également attirer l’attention d’autres chercheurs afin qu’ils continuent d’analyser et d’apporter de nouveaux éléments et de nouvelles approches pour mieux comprendre les sociétés néolithiques.Peer Reviewe

Efectes ecofisiològics d'una sequera experimental sobre l'alzinar de Prades

Postprint (published version

Productions and technical knowledge in the Early Neolithic in Catalonia

The development of the economic activities inherent to the establishment of Neolithic farming activities entails an increasing technical specialization. This is often visible through the exploitation of specific resources, the development of suitable techniques for the manufacture of consumption goods as well as new ways of using and consuming them. We briefly present the main features of the technical productions carried out by the first Neolithic populations in the northeast of Iberia, trying to characterize the technical knowledge spent on all of them and making their signs of specialization clear.[FR] Le développement des activités économiques inhérent à l’implantation des activités agricoles et d’élevage du Néolithique entraîne une spécialisation technique croissante. Cela se traduit souvent par l’exploitation de ressources spécifiques, le développement de techniques appropriées pour la fabrication de biens de consommation, et de nouvelles façons de les utiliser et de les consommer. Nous présentons brièvement les principales caractéristiques des productions techniques réalisées par les premières populations néolithiques du nord-est de la péninsule ibérique, en essayant de caractériser les connaissances techniques dépensées dans chacune d’elles et en mettant en évidence leurs indications de spécialisation

SOHO/SUMER Observations of Prominence Oscillation Before Eruption

Coronal mass ejections (CMEs), as a large-scale eruptive phenomenon, often reveal some precursors in the initiation phase, e.g., X-ray brightening, filament darkening, etc, which are useful for CME modeling and space weather forecast. With the SOHO/SUMER spectroscopic observations of the 2000 September 26 event, we propose another precursor for CME eruptions, namely, long-time prominence oscillations. The prominence oscillation-and-eruption event was observed by ground-based H$\alpha$ telescopes and space-borne white-light, EUV imaging and spectroscopic instruments. In particular, the SUMER slit was observing the prominence in a sit-and-stare mode. The observations indicate that a siphon flow was moving from the proximity of the prominence to a site at a projected distance of 270$''$, which was followed by repetitive H$\alpha$ surges and continual prominence oscillations. The oscillation lasted 4 hours before the prominence erupted as a blob-like CME. The analysis of the multiwavelength data indicates that the whole series of processes fits well into the emerging flux trigger mechanism for CMEs. In this mechanism, emerging magnetic flux drives a siphon flow due to increased gas pressure where the background polarity emerges. It also drives H$\alpha$ surges through magnetic reconnection where the opposite polarity emerges. The magnetic reconnection triggers the prominence oscillations, as well as its loss of equilibrium, which finally leads to the eruption of the prominence. It is also found that the reconnection between the emerging flux and the pre-existing magnetic loop proceeds in an intermittent, probably quasi-periodic, way.Comment: 14 pages, 8 figures, submitted for publication in A&

Physics of Solar Prominences: II - Magnetic Structure and Dynamics

Observations and models of solar prominences are reviewed. We focus on non-eruptive prominences, and describe recent progress in four areas of prominence research: (1) magnetic structure deduced from observations and models, (2) the dynamics of prominence plasmas (formation and flows), (3) Magneto-hydrodynamic (MHD) waves in prominences and (4) the formation and large-scale patterns of the filament channels in which prominences are located. Finally, several outstanding issues in prominence research are discussed, along with observations and models required to resolve them.Comment: 75 pages, 31 pictures, review pape